In this blog we will learn about how to implement JSON in apex. JSON class has methods for serializing Apex objects into JSON format and deserializing JSON content that was serialized using the serialize method in this class, all the fields of the related objects are visible. Using the JSONGenerator class methods, you can generate standard JSON-encoded content and you can include the fields that you want to display.
JSON in Apex
Apex Class : Write the following code in apex class:
public with sharing class JSONClass {
public list<Account> acc { get{
//Fetch the Account List
acc = [Select Id,Name,AccountNumber,AccountSource from Account where name != null limit 50000];
if(acc==null){
acc = new list<Account>();
}
return acc;
} set;}
public string jsonSerial {get{
//JSON Class method
if(acc==null){
jsonSerial = '';
}else{
jsonSerial = JSON.serialize(acc);
}
return jsonSerial;
} set; }
public string jsonGen { get{
//JSON Generator Class method
JSONGenerator gen = JSON.createGenerator(false);//true gives output in pretty print
if(acc==null){
return '';
}else{
gen.writeStartArray();
for(Account a: acc){
gen.writeStartObject();
gen.writeStringField('Name', a.name);
gen.writeStringField('Id', a.Id);
if(a.AccountNumber==null)
gen.writeStringField('Account Number', '');
else{
gen.writeStringField('Account Number',a.AccountNumber);
}
gen.writeEndObject();
}
gen.writeEndArray();
return gen.getAsString();
}
} set; }
}
Visualforce Page : Write the following code in Visualforce Page:
<apex:page controller="JSONClass">
<apex:form>
<strong>Output through the list in data table</strong>:<br/><br/>
<apex:dataTable value = "{!acc}" var = "key">
<apex:column>
<apex:facet name = "header">Account Name</apex:facet>
{!key.Name}
</apex:column>
<apex:column>
<apex:facet name = "header">Account Number</apex:facet>
{!key.AccountNumber}
</apex:column>
</apex:dataTable>
<br/><br/>
<strong>Output Via JSON serialize method</strong> :<br/><br/> {!jsonSerial}
<br/><br/>
<strong>Output Via JSON Generator method</strong> :<br/><br/> {!jsonGen}
</apex:form>
</apex:page>
Output
Support
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